Do you want to help us redefine how AI powers the future of Business Management software, not as an add-on, but as a core part of how people work, decide and grow?
Treat AI as central to their craft, not a feature to bolt on later
At Factorial we're looking for a Product Engineer to help us build and scale our AI-Driven Operations Domain to the next level. As part of this team, which is in charge of providing tools to managers and HR managers in the areas of recruitment, performance, engagement, and trainings, you'll be at the forefront of developing tools and help to improve the way companies take care of their people, their most valuable asset.
If you love solving hard problems and want to build something that truly matters, come build it with us.
We're a team of 200+ Product Engineers building Business Management solution that actually works for the people using it. Our core stack is Ruby on Rails and React but the interesting work right now is what we're building on top of that: agentic workflows, LLM-integrated features, systems that behave probabilistically rather than deterministically.
This is where we build the systems that run the day-to-day reality of work for thousands of companies, systems that must be accurate, compliant and reliable.
You’re comfortable working with Ruby on Rails & React and understand how to integrate AI models into scalable, cloud-native environments.
~ You help teammates who are transitioning from deterministic to probabilistic thinking, not by lecturing, but by working through it together.
~4+ years in software engineering, with some track record (or serious curiosity)



around shipping AI features.
~ You can explain a complex technical decision in English to someone who doesn't write code clearly, without condescension.

You'll spend more time designing systems than writing syntax. That means breaking down complex tasks, defining architecture, and writing high-level prompts that instruct multi-agent systems to generate the underlying code.
That’s why our Engineering Teams follows an office-first, versátil schedule.
However, we also understand the importance of focus and flexibility, so we support remote work when it makes sense — whether for deep work, personal needs, or just a change of scenery.
This balance helps us stay agile, creative, and closely connected, while giving everyone the space to do their best work.
Intro Call → Chat with our Talent Partner about your journey and goals.
Final Coffee Chat → A relaxed conversation with our CTO & VP of Engineering to explore our vision, culture, and your growth.
The whole process is remote, using videoconferencing tools!
At Factorial, we’re building the leading AI Business Management Software for companies of all sizes. Our platform centralizes key workflows across HR, Finance, Talent, Operations, and IT, freeing teams from manual processes so they can focus on what really matters: leading, growing, and taking care of their people. We own it: We take responsibility for every project. We're dedicated to learning something new every day and, above all, share it.
Alan as private health insurance
Save expenses with Cobee
Breakfast in the office and organic fruit

📌 Senior Product Engineer - Operations Domain (Barcelona)
🏢 Factorial
📍 Barcelona